Apple has reportedly delayed the production of its rumored larger-screen iPads, while it works out the final design and features for the product targeted at businesses, says a Wall Street Journal report. (Apple has not announced such a product, which has been the subject of rumors for more than a year.)

Apple purportedly had earlier told suppliers that it wanted to mass-produce a 12.9-inch iPad in the current quarter, the Wall Street Journal reported Wednesday, citing people familiar with the matter. Apple has now moved the production to the second half of this year, according to the report.

Apple's most recent models are the iPad Air 2 with a 9.7-inch screen and the iPad Mini 3, which has a 7.9-inch display.

Among the redesign issues that are the purportedly delaying the company is a rumored decision over the addition of USB ports compliant with the new and faster USB 3.0 specification, the Wall Street Journal said. Again, Apple has not announced that it would bring USB to the iPad.

Another area that Apple is purportedly working on is speeding up the charging time for the device, but it may not figure in the final design, the Journal reported, quoting one of the people familiar with the matter. The company is also considering adding ports for a keyboard and mouse, the report claims.

The purported new large iPad could boost Apple's flagging fortunes in the tablet market. It said it sold 21.4 million iPads in the quarter ended Dec. 27, a year-over-year drop of 18 percent by units and 22 percent by revenue. Its market share dropped to about 28 percent in the fourth quarter of 2014 from around 33 percent in the same quarter a year earlier, amid a 3.2 percent global drop in the number of tablets shipped, research firm IDC reported.